Abstract
Cellular foams based on the cyanate ester, viz., (2,2-bis (4-cyanatophenyl) propane) have been processed. Azodicarbonamide (ADC) was used as the foaming agent. Cyanate ester foams with different densities were processed by varying the concentration of the foaming agent. The effect of foaming agent concentration on the density and compressive properties of the resultant foams has been investigated. The density of the foams was found to be inversely proportional to the concentration of foaming agent up to 2 parts per hundred parts of resin (phr). The increase in density beyond a foaming agent concentration of 2 phr has been attributed to the accelerated curing of cyanate ester, catalysed by the decomposition products of ADC. The compressive strength and modulus of the foams were found to be directly proportional to the density. The specific compressive properties also followed the same trend. Cyanate ester cellular foams exhibited better compressive properties in comparison to similar foams of other thermosets. However, the compressive properties of these cellular foams were inferior to those of the corresponding syntactic foams of comparable density.
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